题解 | #计算日期到天数转换#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner fzhinput = new Scanner(System.in);
        int year = fzhinput.nextInt();
        int month = fzhinput.nextInt();
        int day = fzhinput.nextInt();
        int num=0;
        int ermonthday;
        if(year%4==0&&year%100!=0||year%400==0){
            ermonthday=29;
        }
        else{
            ermonthday=28;
        }

        for(int i =1;i<=month;i++){

            if(i%2==0&&i<8&&i!=2&&i<month){
                num+=30;
            }
            else if(i%2==1&&i<8&&i<month){
                num+=31;
            }
            else if(i==2&&i<month){
                num+=ermonthday;
            }
            else if(i%2==1&&i>7&&i<month){
                num+=30;
            }
            else if(i%2==0&&i>7&&i<month){
                num+=31;
            }
            else if(i==month){
                num+=day;
            }
        }
        System.out.println(num);
    }
}